#ifndef ITEM_ROW_INCLUDED
#define ITEM_ROW_INCLUDED
#include "item_composite.h"
/*
Copyright ( c ) 2002 , 2013 , Oracle and / or its affiliates .
This program is free software ; you can redistribute it and / or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation ; version 2 of the License .
This program is distributed in the hope that it will be useful ,
but WITHOUT ANY WARRANTY ; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE . See the
GNU General Public License for more details .
You should have received a copy of the GNU General Public License
along with this program ; if not , write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/**
Row items used for comparing rows and IN operations on rows :
@ verbatim
( a , b , c ) > ( 10 , 10 , 30 )
( a , b , c ) = ( select c , d , e , from t1 where x = 12 )
( a , b , c ) IN ( ( 1 , 2 , 2 ) , ( 3 , 4 , 5 ) , ( 6 , 7 , 8 )
( a , b , c ) IN ( select c , d , e , from t1 )
@ endverbatim
*/
/**
Item which stores ( x , y , . . . ) and ROW ( x , y , . . . ) .
Note that this can be recursive : ( ( x , y ) , ( z , t ) ) is a ROW of ROWs .
*/
class Item_row: public Item_composite,
private Used_tables_and_const_cache
{
table_map not_null_tables_cache;
/**
If elements are made only of constants , of which one or more are
NULL . For example , this item is ( 1 , 2 , NULL ) , or ( ( 1 , NULL ) , ( 2 , 3 ) ) .
*/
bool with_null;
public :
Item_row(THD *thd, List<Item> &list)
:Item_composite(thd, list),
not_null_tables_cache(0 ), with_null(0 )
{ }
Item_row(THD *thd, Item_row *row)
:Item_composite(thd, static_cast <Item_args*>(row)),
Used_tables_and_const_cache(),
not_null_tables_cache(0 ), with_null(0 )
{ }
const Type_handler *type_handler() const override { return &type_handler_row; }
Field *create_tmp_field_ex(MEM_ROOT *root, TABLE *table, Tmp_field_src *src,
const Tmp_field_param *param) override
{
return NULL; // Check with Vicentiu why it's called for Item_row
}
bool is_null() override { return null_value; }
bool fix_fields(THD *thd, Item **ref) override;
void fix_after_pullout(st_select_lex *new_parent, Item **ref, bool merge)
override;
void cleanup() override;
void split_sum_func(THD *thd, Ref_ptr_array ref_pointer_array,
List<Item> &fields, uint flags) override;
table_map used_tables() const override { return used_tables_cache; };
bool const_item() const override { return const_item_cache; };
void update_used_tables() override
{
used_tables_and_const_cache_init();
used_tables_and_const_cache_update_and_join(arg_count, args);
}
table_map not_null_tables() const override { return not_null_tables_cache; }
void print(String *str, enum_query_type query_type) override;
bool walk(Item_processor processor, void *arg,
item_walk_flags flags) override
{
if (walk_args(processor, arg, flags))
return true ;
return (this ->*processor)(arg);
}
Item *transform(THD *thd, Item_transformer transformer, uchar *arg) override;
bool eval_not_null_tables(void *opt_arg) override;
bool find_not_null_fields(table_map allowed) override;
uint cols() const override { return arg_count; }
Item* element_index(uint i) override { return args[i]; }
Item** addr(uint i) override { return args + i; }
bool check_cols(uint c) override;
bool null_inside() override { return with_null; };
void bring_value() override;
void set_in_ps_safe_context() override
{
Item::set_in_ps_safe_context();
Item_args::set_in_ps_safe_context_args();
}
Item* propagate_equal_fields(THD *thd, const Context &ctx, COND_EQUAL *cond)
override
{
Item_args::propagate_equal_fields(thd, Context_identity(), cond);
return this ;
}
bool excl_dep_on_table(table_map tab_map) override
{
return Item_args::excl_dep_on_table(tab_map);
}
bool excl_dep_on_grouping_fields(st_select_lex *sel) override
{
return Item_args::excl_dep_on_grouping_fields(sel);
}
bool excl_dep_on_in_subq_left_part(Item_in_subselect *subq_pred) override
{
return Item_args::excl_dep_on_in_subq_left_part(subq_pred);
}
bool check_vcol_func_processor(void *arg) override {return FALSE ; }
protected :
bool ora_join_processor(void *arg) override
{
if (with_ora_join())
{
// Oracle join operator is used inside rows.
my_error(ER_INVALID_USE_OF_ORA_JOIN_WRONG_FUNC, MYF(0 ));
return (TRUE );
}
return (FALSE );
}
Item *shallow_copy(THD *thd) const override
{ return get_item_copy<Item_row>(thd, this ); }
Item *deep_copy(THD *thd) const override;
};
#endif /* ITEM_ROW_INCLUDED */
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